Elementary materials that are required to be non-combustible must be tested in accordance with which standard?

• A. ASTM E84
• B. ASTM E136
• C. UL 263
• D. UL 723

Answer: (B)

The standard that requires elementary materials to be tested for non-combustibility is ASTM E136. This standard specifically addresses the test method for assessing the non-combustibility of building materials. Materials that are determined to be non-combustible according to ASTM E136 can be used in specific applications within buildings where fire safety is a concern, such as in high-rise constructions or in areas requiring fire-resistant assemblies.

Other standards mentioned may relate to fire performance but in different contexts. For instance, ASTM E84 evaluates surface burning characteristics and is commonly used for materials that contribute to interior finishes but does not specifically address non-combustibility. UL 263 pertains to fire-resistance-rated structural assemblies, and UL 723 deals with surface burning characteristics for wall and ceiling finishes. While these standards are crucial in fire safety, they do not serve to classify materials as non-combustible as ASTM E136 does.